The transactional model of Lazarus defines stress as an imbalance between the demands of the environment and the individual's resources. According to this model, the individual makes a primary appraisal of the situation or the demand with which he is confronted. The demand may be perceived as a challenge or even a threat if the individual thinks that it may give rise to negative consequences-and-extent. The individual then makes a secondary appraisal where he attempts to determine what resources are available to meet the demand. Thus, workplace stress implies that work-related demands exceed the employee's ability to adapt to these demands. The effects of stress may therefore be positive and provide the motivation, energy and creativity needed to accomplish a task if the individual thinks that he has the abilities and resources needed to succeed at it. The effects of stress will be negative when there is a discrepancy between the individual's resources and the demand.